<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <meta name="keywords" content="HTML, CSS, XML, XHTML, JavaScript">
        <meta name="description" content="Test on HTML and CSS">
        <meta name="author" content="Huoty">
        <meta http-equiv="refresh" content="30">
        <title>Web 设计</title>
        <link rel="shortcut icon" href="http://konghy.cn/favicon.ico" type="image/x-icon" />
    </head>
    <body>
    <img id="captcha" src="data:image/png;base64," onclick="" />

<script type="text/javascript">
function get_captcha() {

}
document.getElementById(randimg).src
</script>
    </body>
</html> 

